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/*
* This file is part of the Marble Virtual Globe.
*
* Copyright 2010 Jens-Michael Hoffmann <jmho@c-xx.com>
* Copyright 2010-2012 Bernhard Beschow <bbeschow@cs.tu-berlin.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "TileLoader.h"
#include <QDateTime>
#include <QFileInfo>
#include <QMetaType>
#include <QImage>
#include <QUrl>
#include "GeoSceneTextureTileDataset.h"
#include "GeoSceneTileDataset.h"
#include "GeoSceneTypes.h"
#include "GeoSceneVectorTileDataset.h"
#include "GeoDataDocument.h"
#include "HttpDownloadManager.h"
#include "MarbleDebug.h"
#include "MarbleDirs.h"
#include "TileId.h"
#include "TileLoaderHelper.h"
#include "ParseRunnerPlugin.h"
#include "ParsingRunner.h"
Q_DECLARE_METATYPE( Marble::DownloadUsage )
namespace Marble
{
TileLoader::TileLoader(HttpDownloadManager * const downloadManager, const PluginManager *pluginManager) :
m_pluginManager(pluginManager)
{
qRegisterMetaType<DownloadUsage>( "DownloadUsage" );
connect( this, SIGNAL(downloadTile(QUrl,QString,QString,DownloadUsage)),
downloadManager, SLOT(addJob(QUrl,QString,QString,DownloadUsage)));
connect( downloadManager, SIGNAL(downloadComplete(QString,QString)),
SLOT(updateTile(QString,QString)));
connect( downloadManager, SIGNAL(downloadComplete(QByteArray,QString)),
SLOT(updateTile(QByteArray,QString)));
}
TileLoader::~TileLoader()
{
// nothing to do
}
// If the tile image file is locally available:
// - if not expired: create ImageTile, set state to "uptodate", return it => done
// - if expired: create TextureTile, state is set to Expired by default, trigger dl,
QImage TileLoader::loadTileImage( GeoSceneTextureTileDataset const *textureLayer, TileId const & tileId, DownloadUsage const usage )
{
QString const fileName = tileFileName( textureLayer, tileId );
TileStatus status = tileStatus( textureLayer, tileId );
if ( status != Missing ) {
// check if an update should be triggered
if ( status == Available ) {
mDebug() << Q_FUNC_INFO << tileId << "StateUptodate";
} else {
Q_ASSERT( status == Expired );
mDebug() << Q_FUNC_INFO << tileId << "StateExpired";
triggerDownload( textureLayer, tileId, usage );
}
QImage const image( fileName );
if ( !image.isNull() ) {
// file is there, so create and return a tile object in any case
return image;
}
}
// tile was not locally available => trigger download and look for tiles in other levels
// for scaling
QImage replacementTile = scaledLowerLevelTile( textureLayer, tileId );
Q_ASSERT( !replacementTile.isNull() );
triggerDownload( textureLayer, tileId, usage );
return replacementTile;
}
GeoDataDocument *TileLoader::loadTileVectorData( GeoSceneVectorTileDataset const *textureLayer, TileId const & tileId, DownloadUsage const usage )
{
// FIXME: textureLayer->fileFormat() could be used in the future for use just that parser, instead of all available parsers
QString const fileName = tileFileName( textureLayer, tileId );
TileStatus status = tileStatus( textureLayer, tileId );
if ( status != Missing ) {
// check if an update should be triggered
if ( status == Available ) {
mDebug() << Q_FUNC_INFO << tileId << "StateUptodate";
} else {
Q_ASSERT( status == Expired );
mDebug() << Q_FUNC_INFO << tileId << "StateExpired";
triggerDownload( textureLayer, tileId, usage );
}
QFile file ( fileName );
if ( file.exists() ) {
// File is ready, so parse and return the vector data in any case
GeoDataDocument* document = openVectorFile(fileName);
if (document) {
return document;
}
}
} else {
// tile was not locally available => trigger download
triggerDownload( textureLayer, tileId, usage );
}
return nullptr;
}
// This method triggers a download of the given tile (without checking
// expiration). It is called by upper layer (StackedTileLoader) when the tile
// that should be reloaded is currently loaded in memory.
//
// post condition
// - download is triggered
void TileLoader::downloadTile( GeoSceneTileDataset const *tileData, TileId const &tileId, DownloadUsage const usage )
{
triggerDownload( tileData, tileId, usage );
}
int TileLoader::maximumTileLevel( GeoSceneTileDataset const & tileData )
{
// if maximum tile level is configured in the DGML files,
// then use it, otherwise use old detection code.
if ( tileData.maximumTileLevel() >= 0 ) {
return tileData.maximumTileLevel();
}
int maximumTileLevel = -1;
const QFileInfo themeStr( tileData.themeStr() );
const QString tilepath = themeStr.isAbsolute() ? themeStr.absoluteFilePath() : MarbleDirs::path( tileData.themeStr() );
// mDebug() << "StackedTileLoader::maxPartialTileLevel tilepath" << tilepath;
QStringList leveldirs = QDir( tilepath ).entryList( QDir::AllDirs | QDir::NoSymLinks
| QDir::NoDotAndDotDot );
QStringList::const_iterator it = leveldirs.constBegin();
QStringList::const_iterator const end = leveldirs.constEnd();
for (; it != end; ++it ) {
bool ok = true;
const int value = (*it).toInt( &ok, 10 );
if ( ok && value > maximumTileLevel )
maximumTileLevel = value;
}
// mDebug() << "Detected maximum tile level that contains data: "
// << maxtilelevel;
return maximumTileLevel + 1;
}
bool TileLoader::baseTilesAvailable( GeoSceneTileDataset const & tileData )
{
const int levelZeroColumns = tileData.levelZeroColumns();
const int levelZeroRows = tileData.levelZeroRows();
bool result = true;
// Check whether the tiles from the lowest texture level are available
//
for ( int column = 0; result && column < levelZeroColumns; ++column ) {
for ( int row = 0; result && row < levelZeroRows; ++row ) {
const TileId id( 0, 0, column, row );
const QString tilepath = tileFileName( &tileData, id );
result &= QFile::exists( tilepath );
if (!result) {
mDebug() << "Base tile " << tileData.relativeTileFileName( id ) << " is missing for source dir " << tileData.sourceDir();
}
}
}
return result;
}
TileLoader::TileStatus TileLoader::tileStatus( GeoSceneTileDataset const *tileData, const TileId &tileId )
{
QString const fileName = tileFileName( tileData, tileId );
QFileInfo fileInfo( fileName );
if ( !fileInfo.exists() ) {
return Missing;
}
const QDateTime lastModified = fileInfo.lastModified();
const int expireSecs = tileData->expire();
const bool isExpired = lastModified.secsTo( QDateTime::currentDateTime() ) >= expireSecs;
return isExpired ? Expired : Available;
}
void TileLoader::updateTile( QByteArray const & data, QString const & idStr )
{
QStringList const components = idStr.split(QLatin1Char(':'), QString::SkipEmptyParts);
Q_ASSERT( components.size() == 5 );
QString const origin = components[0];
QString const sourceDir = components[ 1 ];
int const zoomLevel = components[ 2 ].toInt();
int const tileX = components[ 3 ].toInt();
int const tileY = components[ 4 ].toInt();
TileId const id = TileId( sourceDir, zoomLevel, tileX, tileY );
if (origin == GeoSceneTypes::GeoSceneTextureTileType) {
QImage const tileImage = QImage::fromData( data );
if ( tileImage.isNull() )
return;
emit tileCompleted( id, tileImage );
}
}
void TileLoader::updateTile(const QString &fileName, const QString &idStr)
{
QStringList const components = idStr.split(QLatin1Char(':'), QString::SkipEmptyParts);
Q_ASSERT( components.size() == 5 );
QString const origin = components[0];
QString const sourceDir = components[ 1 ];
int const zoomLevel = components[ 2 ].toInt();
int const tileX = components[ 3 ].toInt();
int const tileY = components[ 4 ].toInt();
TileId const id = TileId( sourceDir, zoomLevel, tileX, tileY );
if (origin == GeoSceneTypes::GeoSceneVectorTileType) {
GeoDataDocument* document = openVectorFile(MarbleDirs::path(fileName));
if (document) {
emit tileCompleted(id, document);
}
}
}
QString TileLoader::tileFileName( GeoSceneTileDataset const * tileData, TileId const & tileId )
{
QString const fileName = tileData->relativeTileFileName( tileId );
QFileInfo const dirInfo( fileName );
return dirInfo.isAbsolute() ? fileName : MarbleDirs::path( fileName );
}
void TileLoader::triggerDownload( GeoSceneTileDataset const *tileData, TileId const &id, DownloadUsage const usage )
{
if (id.zoomLevel() > 0) {
int minValue = tileData->maximumTileLevel() == -1 ? id.zoomLevel() : qMin( id.zoomLevel(), tileData->maximumTileLevel() );
if (id.zoomLevel() != qMax(tileData->minimumTileLevel(), minValue) ) {
// Download only level 0 tiles and tiles between minimum and maximum tile level
return;
}
}
QUrl const sourceUrl = tileData->downloadUrl( id );
QString const destFileName = tileData->relativeTileFileName( id );
QString const idStr = QString( "%1:%2:%3:%4:%5" ).arg( tileData->nodeType(), tileData->sourceDir() ).arg( id.zoomLevel() ).arg( id.x() ).arg( id.y() );
emit downloadTile( sourceUrl, destFileName, idStr, usage );
}
QImage TileLoader::scaledLowerLevelTile( const GeoSceneTextureTileDataset * textureData, TileId const & id )
{
mDebug() << Q_FUNC_INFO << id;
int const minimumLevel = textureData->minimumTileLevel();
for ( int level = qMax<int>( 0, id.zoomLevel() - 1 ); level >= 0; --level ) {
if (level > 0 && level < minimumLevel) {
continue;
}
int const deltaLevel = id.zoomLevel() - level;
TileId const replacementTileId( id.mapThemeIdHash(), level,
id.x() >> deltaLevel, id.y() >> deltaLevel );
QString const fileName = tileFileName( textureData, replacementTileId );
mDebug() << "TileLoader::scaledLowerLevelTile" << "trying" << fileName;
QImage toScale = QFile::exists(fileName) ? QImage(fileName) : QImage();
if ( level == 0 && toScale.isNull() ) {
mDebug() << "No level zero tile installed in map theme dir. Falling back to a transparent image for now.";
QSize tileSize = textureData->tileSize();
Q_ASSERT( !tileSize.isEmpty() ); // assured by textureLayer
toScale = QImage( tileSize, QImage::Format_ARGB32_Premultiplied );
toScale.fill( qRgba( 0, 0, 0, 0 ) );
}
if ( !toScale.isNull() ) {
// which rect to scale?
int const restTileX = id.x() % ( 1 << deltaLevel );
int const restTileY = id.y() % ( 1 << deltaLevel );
int const partWidth = qMax(1, toScale.width() >> deltaLevel);
int const partHeight = qMax(1, toScale.height() >> deltaLevel);
int const startX = restTileX * partWidth;
int const startY = restTileY * partHeight;
mDebug() << "QImage::copy:" << startX << startY << partWidth << partHeight;
QImage const part = toScale.copy( startX, startY, partWidth, partHeight );
mDebug() << "QImage::scaled:" << toScale.size();
return part.scaled( toScale.size() );
}
}
Q_ASSERT_X( false, "scaled image", "level zero image missing" ); // not reached
return QImage();
}
GeoDataDocument *TileLoader::openVectorFile(const QString &fileName) const
{
QList<const ParseRunnerPlugin*> plugins = m_pluginManager->parsingRunnerPlugins();
const QFileInfo fileInfo( fileName );
const QString suffix = fileInfo.suffix().toLower();
const QString completeSuffix = fileInfo.completeSuffix().toLower();
for( const ParseRunnerPlugin *plugin: plugins ) {
QStringList const extensions = plugin->fileExtensions();
if ( extensions.contains( suffix ) || extensions.contains( completeSuffix ) ) {
ParsingRunner* runner = plugin->newRunner();
QString error;
GeoDataDocument* document = runner->parseFile(fileName, UserDocument, error);
if (!document && !error.isEmpty()) {
mDebug() << QString("Failed to open vector tile %1: %2").arg(fileName, error);
}
delete runner;
return document;
}
}
mDebug() << "Unable to open vector tile " << fileName << ": No suitable plugin registered to parse this file format";
return nullptr;
}
}
#include "moc_TileLoader.cpp"
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